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| Number | Title | Issue Date |
| 8151931 | Acoustic noise control in heating or cooling systems A heating or cooling system comprising a powered fan held in a duct assembly. The powered fan generates acoustic noise when blowing air. The system also comprises an acoustic wave modulator held in the duct assembly. The acoustic wave modulator has one or more fins ... | 04/10/2012 |
| 8146706 | Air duct for vehicle air conditioning and air conditioner for vehicle An air duct for vehicle air conditioning, includes a duct body defining a passage, and a passage dividing wall for dividing an interior of the duct body into a first passage and a second passage. In the air duct, the width of the duct body in an arrangement directio... | 04/03/2012 |
| 8091682 | Sound absorbing system for electronic device Disclosed herein is a sound absorbing system used for an electronic device that has enhanced noise reduction capabilities, while maintaining the cooling performance of the device and without increasing the size of the device. A disk array has multiple fans installed... | 01/10/2012 |
| 8087491 | Vane type silencers in elbow for gas turbine A silencer for a gas turbine includes a first duct portion; a second duct portion connected to the first duct portion, the first and second duct portions forming an elbow region at the connection; and a plurality of elbow shaped vanes provided in the elbow region. T... | 01/03/2012 |
| 8087492 | Methods and systems for integrating sound attenuation into a filter bank A filter bank is provided. The filter bank includes a housing having a front face and a back face. Air flows along an air flow path from the front face to the back face. A filter layer is held in the housing. The filter layer is oriented between the front and back f... | 01/03/2012 |
| 8069947 | Sound attenuation canopy A sound attenuation canopy for reducing levels of sound passing through an opening comprises a sound absorbing member. The sound absorbing member is comprised of a flexible sound absorbing material and has a first end, a second end and an intermediate portion extend... | 12/06/2011 |
| 8061476 | Sound dampening flow channel device The invention presents a sound dampening flow channel device defining at least one flow channel having an inlet opening and an outlet opening, the flow channel being at least partly delimited by at least one acoustic energy dissipative wall. The outlet opening of th... | 11/22/2011 |
| 8061477 | Acoustic management of fluid flow within a duct Apparatus and methods described herein provide for the management of noise associated with a duct. A sound-dampening apparatus is provided consisting of a duct through which a fluid flows, such as an air duct. A flexuous cord is helically wound around the inner or o... | 11/22/2011 |
| 8020663 | Method for reducing the noise generated by a hole under a high energy gas flow According to the invention, at least part of the edge of the hole is loosely surrounded with a mesh structure so as to create a space between the latter and said edge part. ... | 09/20/2011 |
| 7909135 | Silencer and electronic apparatus having the same A silencer that reduces a noise from a noise source in a first housing that houses the noise source in a first internal space includes a second housing that houses the noise source in a second internal space, and is provided in the first internal space of the first ... | 03/22/2011 |
| 7866441 | Noise level reduction of sparger assemblies A method results in a system configuration wherein positioning a plurality of spargers reduces noise levels caused by fluid passing through the plurality of spargers. The method includes providing the plurality of spargers, each sparger having a center line access a... | 01/11/2011 |
| 7815012 | Noise optimized air distributor An air distributor is provided that includes, but is not limited to a perforated body, insertable at a joint between a first air duct, which extends in one direction, and a second air duct, that extends in a second different direction, to redirect air flowing in the... | 10/19/2010 |
| 7806228 | Single duct silencing terminal unit An apparatus and method for attenuating the sound generated by a single duct terminal unit in an HVAC (heating, ventilating, and air conditioning) system. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects with... | 10/05/2010 |
| 7802651 | Air duct assembly for vehicles Disclosed herein is an air duct assembly for vehicles which reduces noise generated by the flow of intake air which flows along a path of the air duct provided in a vehicle and is fed to an engine. The air duct reduces the noise of a low frequency range in initial e... | 09/28/2010 |
| 7549507 | Duct wall structure The invention relates to an inner heat insulating and inner sound insulating structure of an HRSG duct wall in which a turbine combustion high temperature and high velocity gas whose temperature is approx. 650° C. and velocity is 30 meters per second (m/s) flows, w... | 06/23/2009 |
| 7516815 | Arrangement for the generation of sonic fields of a specific modal composition A device for simulating sound produced by certain equipment, for example a rotor-stator arrangement of a turbomachine, or for generation of opposing sound fields for active sound control, including active sound reduction and active sound amplification, comprises flo... | 04/14/2009 |
| 7503426 | Reflecting plate type silencer pipe A reflecting plate type silencer pipe including a reflecting plate is provided for reducing a dominant frequency noise passing through a pipeline. Sound waves propagated in the pipeline as a one-dimensional plane wave are divided into two, that is, sound waves advan... | 03/17/2009 |
| 7434657 | Acoustic foam sound reducer for vacuum power unit A power unit for an in-wall vacuum cleaning system has a first compartment which contains a motor for producing a vacuum at remote wand receptacles and a second compartment for separating and collecting the debris. An improved sound reducer is mounted in the motor c... | 10/14/2008 |
| 7350619 | Auxiliary power unit exhaust duct with muffler incorporating an externally replaceable acoustic liner Methods and apparatus are provided for an exhaust duct having an externally replaceable acoustic liner. The exhaust duct includes a forward section that is configured to be axially coupled with a bulkhead collar on the aircraft, a body section that is coupled to the... | 04/01/2008 |
| 7348526 | Microwave-assisted chromatography preparation An instrument and associated method are disclosed for preparing samples for column chromatography. The method includes the steps of applying microwave energy to a sample composition containing at least one solvent to encourage a chemical reaction and generate desire... | 03/25/2008 |
| 7341448 | Gas-fired heating apparatus The gas-fired heating apparatus, especially a water heater, has a combustion chamber (2a); an atmospheric gas burner (5) within the combustion chamber (2a); a combustion gas/air supply system (18) having an intake device ( | 03/11/2008 |
| 7337876 | Suction apparatus with noise reduction means A suction apparatus is provided with noise reduction means in one or more airflow passages for reducing noise emission from an airflow generator or the like, wherein at least one airflow passage is provided with at least one indentation with a predetermined depth ex... | 03/04/2008 |
| 7337875 | High admittance acoustic liner A cooled acoustic liner useful in a fluid handling duct includes a resonator chamber 52 with a neck 56, a face sheet 86, and a coolant plenum 80 residing between the face sheet and the chamber. Coolant bypasses the resonator chamber, rath... | 03/04/2008 |
| 7334662 | Equipment enclosure acoustical door with low impedance distributed air flow An acoustic door for an equipment enclosure, such as a rack mount cabinet, also provides a low impedance air flow uniformly delivered across the cabinet opening. A pair of metal panels, with acoustic foam along the rear surfaces, extend angularly outward and toward ... | 02/26/2008 |
| 7334663 | Variable resonator A communicating pipe is disposed on an outer periphery of an air intake pipe, and a conduit is formed so as to be parallel to an air intake passage. A plurality of first communicating apertures are disposed through the air intake pipe so as to be arranged in a singl... | 02/26/2008 |
| 7328586 | Repositionable attenuator A repositionable attenuator for a terminal unit in a heating, ventilation, and air conditioning system is disclosed. The attenuator is positionable between at least a first and a second position. This enables the attenuator to be attached to and shipped with the ter... | 02/12/2008 |
| 7329456 | Method of fabrication of an acoustical substrate into a three dimensional product A method of forming a box-like acoustical substrate is provided. Portions of an acoustical substrate having a decorative surface are compressed to form a flange, a first compressed region, a second compressed region, and a third compressed region. First, second, cen... | 02/12/2008 |
| 7322441 | Extended bandwidth folded well diffusor An extended bandwidth folded well diffusor extends the diffusion bandwidth of a shallow, asymmetric diffusor by incorporating maximum-depth, folded L-shaped, half-width wells on both ends (sides) of a diffusor, thus providing increased maximum well depth without inc... | 01/29/2008 |
| 7316292 | Spun extrusion side entry muffler By using a spun extrusion method to form a side entry exhaust inlet, a muffler can be completely stuffed and end caps can be spun onto opposing ends of the muffler on a high speed production line without interruptions. The side entry exhaust inlet is formed within a... | 01/08/2008 |
| 7314113 | Acoustic absorbers for use with computer cabinet fans and other cooling systems Systems and methods for absorbing acoustic noise generated by computer cabinet cooling fans are described herein. In one embodiment, an acoustic absorber for use with a fan carried by a computer cabinet in a room includes a first acoustic panel spaced apart from a s... | 01/01/2008 |
| 7303048 | Method for filtering ultrasonic noise within a fluid flow system A method is employed to attenuate ultrasonic noise propagating in a flow stream of a fluid flow system. In particular, the method attenuates the noise propagating between a noise source and a reference point in the flow stream (wherein the reference point and the no... | 12/04/2007 |
| 7303046 | Apparatus for filtering ultrasonic noise within a fluid flow system A method is employed to attenuate ultrasonic noise propagating in a flow stream of a fluid flow system. In particular, the method attenuates the noise propagating between a noise source and a reference point in the flow stream (wherein the reference point and the no... | 12/04/2007 |
| 7303047 | Apparatus for filtering ultrasonic noise within a fluid flow system A method is employed to attenuate ultrasonic noise propagating in a flow stream of a fluid flow system. In particular, the method attenuates the noise propagating between a noise source and a reference point in the flow stream (wherein the reference point and the no... | 12/04/2007 |
| 7293454 | Anti-aliasing acoustic filter in the presence of pulsating flow An exhaust flow measurement system uses a noise attenuation device to cancel exhaust gas pulsations at the harmonic frequency of a flow rate measurement transducer. ... | 11/13/2007 |
| 7278514 | Acoustic noise filter An acoustic filter is provided with a single flow chamber for exposure of a flexible rubber layer to liquid undergoing flow through the flow chamber with noise producing acoustic energy therein. The flexible rubber layer is supported on a cylindrical drum with slant... | 10/09/2007 |
| 7273130 | Device and method for active soundproofing, and power unit for aeroplanes A device for active noise reduction has a chamber, which is arranged laterally in relation to a gas flow, and a chamber opening constructed in one wall of the chamber. In the area of the chamber opening, a deflection device is adjustably arranged. The deflection dev... | 09/25/2007 |
| 7258196 | Noise attenuator with laterally moving baffles A silencer or sound attenuator for gas flows that makes use of noise baffles is provided with a lateral movement mechanism which allows the baffles to be moved perpendicular to the direction of the gas flow within the silencer. A silencer provided with the lateral m... | 08/21/2007 |
| 7255197 | Muffler A muffler which reduces noises of a wide frequency band with a simple structure. Sound waves of an intake duct enter into and are received in a resonance box via a branch pipe. At the branch pipe, a movable body slidingly abuts a peripheral portion of an opening of ... | 08/14/2007 |
| 7246680 | Sound dampening assembly for automotive exhaust system A sound dampening assembly adapted to engage an exhaust pipe in an automotive engine exhaust system adjacent an outlet of an internal combustion engine. The assembly includes a bottle portion having a single opening and an interior defining a predetermined amount of... | 07/24/2007 |
| 7244108 | Hermetic compressor with an improved cylinder head-suction muffler assembly This invention relates to a hermetic compressor used on a refrigerant cycle such as a refrigerator, and discloses a low noise compressor designed to attenuate a resonance sound in a compression chamber and intake pressure pulsing more operatively at a position adjac... | 07/17/2007 |
